Definition
A micro-market is an analytical unit in which a particular demand unit can treat particular supply units as eligible alternatives within a stated window. A catalogue category is not automatically a micro-market. The same item in different cities, incompatible time slots for an urgent service, or non-substitutable price bands may not compete for the same demand.
This differs from a marketing segment. A marketing segment groups similar users for communication or product design. A micro-market groups match opportunities. One participant may enter several micro-markets over time.
Working model
category × geography × time window × conditions × substitutability rule
The first four fields are candidate boundaries, not mandatory dimensions. The final field is essential: the team must explain why two supply units are realistic alternatives for one demand unit.
Procedure
Name the decision
Examples include where to acquire supply, where to stop acquisition, where ranking needs attention, and where demand is missing. Segmentation without a decision produces detail faster than value.
Define demand and supply units
Fix an eligible demand event, its start and end, deduplication, and waiting window. Define available eligible supply rather than all supply ever created. A listing may require freshness and availability; a service provider may need compatible time and geography.
State substitutability
Two supply units belong together when demand can select either without changing the original job. Start with an expert rule, then test it with joint impressions, transitions, saves, contacts, or realised choices. Behaviour does not prove perfect substitution, but it can reject an implausibly broad boundary.
Add dimensions one at a time
Begin with the coarsest explainable partition. Add time, price, or another condition only when it explains persistent within-segment heterogeneity and leaves enough observations for a stable read.
Test both sides and version the rule
A useful boundary reduces heterogeneity in demand behaviour and supply availability. Record the effective date, eligibility rules, dictionaries, treatment of new categories, and a mapping to the previous version. Do not silently continue a time series after changing its unit.
Validate against the decision
The partition is useful when it separates states that call for different actions. A platform aggregate may look balanced while one micro-market has unmet demand and another has zero-exposure supply. The next observation or controlled test should then distinguish the two working hypotheses.
Minimum diagnostic set
Use qualified demand, eligible supply, unmet demand share, zero exposure share, time to match, and transaction completion rate. Keep them separate. The same supply-to-demand ratio can coexist with different exposure, speed, and completion outcomes.
Illustrative example
A city-level category appears balanced. Splitting it by service zone and two-hour windows reveals demand scarcity in one set and supply receiving no qualified exposure in another. The first state supports a supply-availability hypothesis; the second supports an allocation or quality hypothesis. No numerical threshold is claimed.
Anti-example
Using internal team ownership or the catalogue tree as a micro-market definition. Those structures allocate responsibility but do not establish substitutability.
Quality checks
- Every eligible unit has one explainable membership or an explicit multi-membership rule.
- Small dictionary changes do not move a large market share without a business reason.
- Sparse cells follow a preregistered pooling or no-conclusion rule.
- Neighbouring micro-markets show meaningful constraints rather than random noise.
- Each diagnostic state maps to a decision the team can make.
Strongest counterargument
Partitioning creates noise, small samples, and local optimisation. That is correct when segmentation is unconstrained. The framework therefore starts with the coarsest defensible boundary, adds a dimension only after persistent heterogeneity, and retains platform-level guardrails. A micro-market is a diagnostic layer, not an organisational redesign.